Teaching Math in 1950:

A logger sells a truckload of lumber for $100. His cost of
production is 4/5 of the price. What is his profit?

Teaching Math in 1960:

A logger sells a truckload of lumber for $100. His cost of
production is 4/5 of the price, or $80. What is his profit?

Teaching Math in 1970:

A logger exchanges a set "L" of lumber for a set
"M" of money. The cardinality of set "M" is 100.
Each element is worth one dollar. Make 100 dots representing the
elements of the set "M." The set "C", The cost
of production contains 20 fewer points than set "M."
Represent the set "C" as a subset of set "M" and
answer the following question: What is the cardinality of the set
"P" of profits?

Teaching Math in 1980:

A logger sells a truckload of lumber for $100. His cost of
production is $80 and his profit is $20. Your assignment: Underline
the number 20.

Teaching Math in 1990:

By cutting down beautiful forest trees, the logger makes $20. What
do you think of this way of making a living? Topic for class
participation after answering the question: How did the forest birds
and squirrels feel as the logger cut down the trees? (There are no
wrong answers.)

Teaching Math in 2000:

A logger sells a truckload of lumber for $100. His cost of
production is $120. How does Arthur Andersen determine that his
profit margin is $60?

Teaching Math in 2010:

El Loggero se habla with the truckero y se ponen de acuerdo con otro
driver de la competencia y etc...